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August 15th. A certain place.In a town where spirits that returned for the Bon Festival became visible, Takayoshi Nao looks for someone.It's the girl he loves, Aoi, who passed away half a year ago in a traffic accident.It's been three days since the strange phenomenon of seeing spirits began and Nao, once again, leaves flowers at the memorial where Aoi was taken. It was then when he saw a familiar figure.
A world where the machine civilization has perished and immortal monsters called “Monotsuki” (“Possessed”) are rampant. Isana, a girl born in a remote village, meets an android who lost her memories and looks exactly like her sister, who should have disappeared in the ruins she wandered into. Convinced that her sister is alive, Isana gives the mechanical person the name “Hime” (“Princess”) and they set out together on a journey to find her sister.